A winter activity for a bored child
My kids have always loved being active, even when it was cold outside and they couldn't get out to play. One of their favorite games to play is "war". We build up our towns with all kinds of blocks, ramps and other things then hide little plastic soldiers behind things. Then we take turns rolling a small ball (it needs to have some weight to it, like a bouncy ball) at each others "towns" and destroying things. The object is knock all soldiers down.
Another one is to build forts. They have taken every pillow, blanket and other random objects to build one. Even the 15 year old still likes this one!
It's ok though, I got them back.